UC2843B: High Performance Current Mode PWM Controller

Datasheet: High Performance Current Mode Controller
Rev. 18 (408.0kB)
Product Overview
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Product Change Notification
The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.

Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering.

These devices are available in an 8-pin dual-in-line and surface mount (SO-8) plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage.

The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).
Features
 
  • Trimmed Oscillator for Precise Frequency Control
  • Oscillator Frequency Guaranteed at 250 kHz
  • Current Mode Operation to 500 kHz
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle-By-Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • Pb-Free Packages are Available
Technical Documentation & Design Resources
Data Sheets (1) Package Drawings (3)
Availability & Samples
Specifications
Case Outlines
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
UC2843BD1G Active
Pb-free
Halide free
UC2843B SOIC-8 751-07 1 260 Tube 98 $0.2343
UC2843BD1R2G Active
Pb-free
Halide free
UC2843B SOIC-8 751-07 1 260 Tape and Reel 2500 $0.2285
UC2843BDG Lifetime
Pb-free
Halide free
UC2843B SOIC-14 751A-03 1 260 Tube 55 $0.2651
UC2843BDR2G Active
Pb-free
Halide free
UC2843B SOIC-14 751A-03 1 260 Tape and Reel 2500 $0.24
UC2843BNG Active
Pb-free
Halide free
UC2843B PDIP-8 626-05 NA Tube 50 $0.3467
Market Leadtime (weeks) : 2 to 4
Avnet   (2020-08-19 00:00) : >1K
FutureElectronics   (2020-08-19 00:00) : <1K
ON Semiconductor   (2020-09-02 00:00) : 5,782
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >10K
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 825
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
Avnet   (2020-08-19 00:00) : >1K

Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
Control Mode
fsw Typ (kHz)
Stand-by Mode
UVLO (V)
Short Circuit Protection
Latch
Soft Start
VCC Max (V)
Drive Cap. (mA)
Package Type
UC2843BD1G  
 $0.2343 
Pb
H
 Active   
Flyback
Current Mode
52
No
Yes
Yes
No
No
30
200 / 200
SOIC-8
UC2843BD1R2G  
 $0.2285 
Pb
H
 Active   
Flyback
Current Mode
52
No
Yes
Yes
No
No
30
200 / 200
SOIC-8
UC2843BDR2G  
 $0.24 
Pb
H
 Active   
Flyback
Current Mode
52
No
Yes
Yes
No
No
30
200 / 200
SOIC-14
UC2843BNG  
 $0.3467 
Pb
H
 Active   
Flyback
Current Mode
52
No
Yes
Yes
No
No
30
200 / 200
PDIP-8
Case Outlines
751-07    751A-03    626-05   
Packages
UC2843B: High Performance Current Mode PWM Controller
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